Rear Gear Ratio
#2
I can't tell you exactly as there are at least five ratios standard, and two dealer ratios possible.
Do you know the code on the rear end, it will be two letters? AND are you sure its original? A lot of things can change in 45+years.
For example:
SA 2.78
SC 3.08
and others.
The only way to know for sure is to drop the cover. Fluid probably needs changed anyways.
Have you checked out this site. Its all about 65's. http://www.442bro.com/
Do you know the code on the rear end, it will be two letters? AND are you sure its original? A lot of things can change in 45+years.
For example:
SA 2.78
SC 3.08
and others.
The only way to know for sure is to drop the cover. Fluid probably needs changed anyways.
Have you checked out this site. Its all about 65's. http://www.442bro.com/
#3
I haven't got the car home yet so can't check the rear end. I've got fairly detailed info as to what's been done to the car in the last 15 yrs. and other than a recent oil change and new seals nothing has been done to the rear axle, but I can't say prior to that. Pretty sure the drive train is original tho.
#4
fyi
It could also be a 2.93. The Oshawa cars sometimes got Buick rear end gear ratios instead of the more common Olds ratios. Both brands were built side by side and I pulled apart several 1965 F-85 and Cutlass cars that had the 2.93 set up.
Most likely it will be a 2.78 open rear end.
Most likely it will be a 2.78 open rear end.
#6
For 1965, Cutlass (series 38), convertible (style 67), Jetaway, & V-8; the CSM says that it could be 3.23, 3.55, or 3.08. It looks like 2.78 was not used for this combination. It says that the 3.55 used a speedometer cable adapter with a 0.8653 to 1 ratio. Tires were 7.35 or 7.75 x 14. There is a code stamped on the housing. Sales information indicates that 3.08 was standard with the other two optional as "performance" ratios. All that's assuming that nothing's been changed. The surefire way is to remove the cover, count teeth and do some division. I don't know if the Canadian cars were treated differently.
Last edited by Ozzie; June 4th, 2016 at 12:11 AM. Reason: Added information
#7
but...
For 1965, Cutlass (series 38), convertible (style 67), Jetaway, & V-8; the CSM says that it could be 3.23, 3.55, or 3.08. It looks like 2.78 was not used for this combination. It says that the 3.55 used a speedometer cable adapter with a 0.8653 to 1 ratio. Tires were 7.35 or 7.75 x 14. There is a code stamped on the housing. Sales information indicates that 3.08 was standard with the other two optional as "performance" ratios. All that's assuming that nothing's been changed. The surefire way is to remove the cover, count teeth and do some division. I don't know if the Canadian cars were treated differently.
#9
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